* {
    margin: 0;
    padding: 0;
}

#container {
    height: 1200px;
    display: flex;
}

#container nav {
    width: 280px;
    background-color: #272930;
}

#container main {
    min-width: 1000px;
    flex: 1;
}

#nav-head {
    height: 64px;
    line-height: 64px;
    padding-left: 20px;
    position: relative;
    font-size: 24px;
    color: #fff;
    background-color: #49AFCD;
}

#system-title {
    display: inline-block;
    cursor: pointer;
}

#nav-collpse-btn {
    width: 28px;
    height: 28px;
    line-height: 28px;
    display: inline-block;
    position: absolute;
    top: 17px;
    right: 20px;
    border-radius: 3px;
    background-color: rgba(0, 0, 0, 0.15);
    font-size: 20px;
    text-align: center;
    cursor: pointer;
}

#nav-collpse-btn:hover {
    background-color: rgba(0, 0, 0, 0.25);
}

#user-profile {
    height: 50px;
    padding: 20px;
    position: relative;
}

#user-face {
    width: 50px;
    height: 50px;
    display: inline-block;
}

#user-face img {
    width: 50px;
    height: 50px;
    border-radius: 100%;
}

#user-name {
    margin-top: 14px;
    margin-left: 15px;
    height: 22px;
    line-height: 22px;
    display: inline-block;
    font-size: 22px;
    color: #0070a9;
    vertical-align: top;
    cursor: pointer;
}

#user-name:hover {
    color: #0088cc;
    text-decoration: underline;
}

#logout-btn {
    margin-top: 18px;
    height: 14px;
    line-height: 14px;
    display: inline-block;
    position: absolute;
    right: 20px;
    font-size: 14px;
    color: #c1c12c;
    vertical-align: top;
    cursor: pointer;
}

#logout-btn .fa-sign-out {
    margin-right: 3px; 
}

#logout-btn:hover {
    color: #ecec30;
}

#nav-items .nav-item {
    line-height: 40px;
    border-top: 1px solid #2F3137;
    border-bottom: 1px solid #1C2026;
    position: relative;
    color: #ffffff;
}

.nav-item-chevron {
    height: 40px;
    position: absolute;
    right: 20px;
    top: 0;
    bottom: 0;
    font-size: 12px;
    transform: rotateZ(0deg);
    transition: all 0.5s;
}

.nav-item-chevron-rotate {
    transform: rotateZ(90deg);
    transition: all 0.5s;
}

.nav-item-title {
    height: 40px;
    line-height: 40px;
    padding-left: 20px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
}

.nav-item-title .fa {
    margin-right: 10px;
}

.nav-item-title:hover {
    color: #ffffff;
    background-color: #22242b;
}

.nav-sub-items {
    padding: 10px 0;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    background-color: #1d1f26;
}

.nav-sub-item {
    height: 30px;
    line-height: 30px;
    padding-left: 35px;
    cursor: pointer;
}

.nav-sub-item:hover {
    color: #ffffff;
    background-color: rgba(0,0,0,0.3);
}

.nav-sub-item-active {
    padding-left: 33px;
    border-left: 2px solid #49afcd;
    color: #ffffff;
    background-color: rgba(0,0,0,0.3);
}

main {
    background-color: #f5f5f5;
}